Lord Belami & Miss Deirdre Gower Series by Joan Smith

Deirdre Gower's aunt, the Duchess of Charney, had trapped Lord Belami into offering for her niece. Deirdre had accepted in order to escape having to marry someone she disliked. But now, at Beaulac for the New Year's holiday, both participants were ready to renege on the engagement--until solving the mystery of the duchess's stolen diamond threw them together. Regency Romance/Mystery by Joan Smith

Deirdre Gower refused to ruin her fiancé, Lord Belami, by marrying him—if her aunt proved to have murdered her brother. But the Duchess had brought the ancient Lord Dudley a bowl of stew, and he had succumbed to arsenic poisoning. The Duchess, Sir Nevil Ryder and who else wished to silence the old man before he could change his will? Regency Romance/Mystery by Joan Smith; originally published by Fawcett

Deirdre Gower refused to marry her fiancé, Lord Belami, while her Aunt Charney was desperately ill with the ague. His lordship took offense at the continual delays and called the whole thing off. But they both wound up on the continent where they were supposed to have had their honeymoon, and where Belami pursued notorious counterfeiters—and Deirdre. New Epilogue added for ebook. Regency Romance by Joan Smith; originally published by Fawcett Crest